Extrusion presses



Jan. 28, 1964 3,119,493

F- J. ZILGES EXTRUSION PRESSES Filed June 27, 1960 4 Sheets-Sheet 1 t2INVENTOE 1. cf. Z z/Lyea Jan. 28, 1964 Filed June 27, 1960 F. J. ZILGESEXTRUSION PRESSES 4 Sheets-Sheet 2 4 Sheets-Sheet 3 Fiied June 27, 1960WVENm/Q FJZges United States Patent 3,119,493 EXTRUSION PRESSES Franzlosef Zilges, Rheydt, Germany, assignor to SchioemannAktiengesellsehaft, Dusseldorf, Germany Filed June 27, 1960, Ser. No.39,165 Claims priority, application Germany .luly 1, 1959 4 Claims. (Cl.207-1) This invention relates to an extrusion press with an axiallyretractable container, and with at least one holding arm, which isrotatable about an axis parallel to the axis of the press, for thepurpose of rocking the die holder and a die into the working position,and is displaceable in the direction of the press axis for the purposeof enabling the extruded product to be severed between the die and abolster. In such presses, upon the retraction of the container,particularly when bridgedies are employed (that is, dies with which apress mandrel or forging die is provided by means of radial ribs), astrong pull is exerted upon the die adhering to the container by meansof the extrusion material. This pull produces a strong tilting moment ofthe arm carrying the die upon its pivot, so that the arm and the pivot,together with their bearing, have to be very stoutly constructed.

The object of this invention is to provide such a method of constructionas will enable the tilting moment exerted by the die-carrying arm uponits shaft to be taken up in a more advantageous manner.

The invention consists in providing, on the bolster of the press, asliding member, which prevents axial movement of the die and die-holderand/or of the rotary arm.

Particularly advantageous is a construction in which the die (or thedie-holder) has two opposite abutment surfaces, one of which engagesbehind an abutment of the rotary arm, whilst the other projects out of aforkshaped aperture in the rotary arm, and is engaged over by the barwhen slid forward. With such a construction only half the pull istransmitted to the rotary arm, and this represents a considerablerelieving of the latter.

If the slide is provided with arms that overlap the rotary arm, aconsiderable portion of that pull which is transmitted from the die tothe rotary arm is further transmitted to the slide, whereby a furtherrelieving of the rotary arm and of the structural elements associatedwith it, particularly the pivot or shaft, is obtained.

For taking up the force that still accrues upon the rotary arm, theshaft carrying the rotary arm, which, for the purpose of axialdisplacement of the die is longitudinally slidable in a hearing, may, inthat position in which the die bears on the bolster, extend with its endinto a second bearing, in which it can be locked against longitudinaldisplacement.

The invention also admits of being advantageously adopted when a secondrotary arm carrying intermediate pieces is provided. In this form of theinvention the arrangement is such that the intermediate-piece rotary armcan be coupled to the die rotary arm in such a way that the die rotaryarm can be rotated either alone or together with the intermediate-piecerotary arm.

Further details of the invention will be gathered from the followingdescription of one form of construction of the invention which isillustrated by way of example in the accompanying drawings, in which:

FIGURE 1 shows a cross section through the press after withdrawal of thecontainer, on the line II in FIGURE 2;

FIGURE 2 an axial section on the line =IIII in FIGURE 1;

FIGURE 3 an axial section on the line III-III in FIGURE 1, but with theindividual parts of the press in different relative positions; and

FIGURE 4 a diagrammatic plan view of the press as a whole.

The bolster 1 is connected in the usual manner, by means of fourtie-rods 40, with the main extrusion cylinder 41, in which a presspiston moves when pressure liquid is forced into the cylinder throughpressure pipes 42 alternately. The bolster 1 and the cylinder 41 arestationary upon a foundation. Between them a container holder 29enclosing the extrusion container 28 and its sleeves 27 is slidable, bymeans of two rods 43, which at their ends are attached to pistons 44,which are movable to and fro in stationary displacement cylinders 4 5,when pressure liquid is introduced through hydraulic pressure pipes 46alternately.

In the bolster 1 (FIGURE 2) is fitted a pressure body 2, with aninserted pressure-piece 3. These three parts are invariable relativelyto one another in the operation of the press. An intermediate piece 4 ismounted on an arm 5, which is connected with a hollow shaft '6, which isrotatable about a shaft 7. Against the intermediate piece 4 bears a diepressure body or ring 8, against which, in its turn, the die 9 bears.The pressure body 8 and the die 9 are held together by a die-holder 10,which is mounted on a rockable arm 11, which is mounted fast upon theshaft 7. The rockable arm 11 may advantageously be made double, that isto say, there are two arms 11 extending in opposite directions from theslidable shaft 7, the second arm carrying a pressure body 8a, a die 9aand a die-holder 10a, exactly corresponding to the pressure body 8, thedie 9 and the die-holder 10 carried by the first arm 11. The arm 5 maysimilarly be made double, and may carry a second intermediate piece 4a.The arm 11 embraces the die-holder 10 with two ends 12 and 13 like theprongs of a fork. As shown in FIGURE 2, the die-holder 10 and the forkedends 12 and 13 have shoulders .14, by means of which the dieholder isprevented from moving towards the right, in FIGURE 2. On the bolster 1is so mounted as to be longitudinally slidable a sliding member 15,which is displaceable in a horizontal direction (compare FIG- URES 1 and3) with the aid of a hydraulic cylinder 16 and a hydraulic piston 17.While FIGURE 3 shows the outer position of the slide 15, FIGURE 1 showsits inner position. In this inner position the slide overlaps, with asemicircular abutment 18-, a corresponding abutment 19 on thedie-holder, which corresponds to a similar abutment 2% on the oppositeside of the die-holder. The die-holder is therefore prevented frommoving towards the right (in FIGURE 2) on one side by the rotary arm 11,and on the other side by the slide 15. Over the prongs .12 and 13 of therotary arm engage arms 21 and 22 of the slide 15, which, owing to theshoulder surface 23, prevent the prongs of the rotary arm 11 movingtowards the right in FIGURE 2. The slide 15 is guided underneath in adovetail-shaped groove 25, and above in a groove 26, so that in themanner that is usual with sliding bars it is permitted to movelongitudinally but not to move transversely. Against the die 9 is setthe sleeve 27 of the container 28, which is mounted in acontainer-holder 29, which can be drawn back towards the right by meansof rods 43 and pistons 44-, as shown by FIGURE 4. The shaft '7 can bedisplaced towards the right, into the position shown in FIGURE 3, by apiston 30, which is movable to and fro (FIGURE 3) in a cylindtr 31. Thehollow shaft *6, with the arm 5 can be rotated by means of a pinion 32,which can be coupled to the hollow shaft by a clutch 33. The pinion 32is non-rotatably but slidably mounted on the shaft 7, so that when thepinion 32 is driven, either the shaft 7 3 alone or the shaft 7 togetherwith the hollow shaft 6 can be rotated. If the shaft 7 is shifted to theleft (FIG- URE 3), its left-hand end passes through an aperture 34 inthe bolster, and assumes the dot-and-dash position 7a.

In this position it can be locked by pushing in two sliding bars 35, sothat it can then no longer be displaced to- Wards the right.

During extrusion the individual parts assume the positions shown inFIGURE 2. When the contents of the container sleeve 27 are substantiallyextruded through the die 9, there remains an extrusion residue, by whichthe die 9 adheres rather firmly to the container sleeve 27. This isparticularly the case when the die 9 is constructed as a so-calledbridge-die. The sliding bars 35 are then released, and the slide 15 isslid towards the right (FIGURE 1). Thereupon the container 28 is movedtowards the right (FIGURE 3), in which case it generally pulls after itthe die 9, together with the die pressure ring 8. The shaft 7 is therebyalso drawn to the right, so that the position according to FIGURE 3cours. The extruded product 37 is thereupon severed with a saw 36,whereupon the container 28 is moved to the left again into its originalposition. The sliding members 35 and 1 are closed again. If thecontainer 28 now travels to the right, it tears itself free from the die9, for which purpose however a considerable tensile tfiorce usually hasto be employed. This tensile force is substantially transmitted to theslide 15, and only to the slightest extent to the shaft 7, which, inorder to be able to take up its share of the tensile force, is stillheld by the sliding bars 35. The displacing piston and cylinder 30, 31need not therefore be very strongly constructed. The intermediate piece401, which is rocked out of the Working position, may be taken out ofthe arm 5, and replaced by another tool, which has been cooled.

I claim:

1. An extrusion press, comprising: a bolster, a container axiallymovable towards and away from the bolster, a shaft parallel to theextrusion axis, a rotary holding arm mounted fast on the said shaft, adie-holder carried by the rotary holding arm, and so held as to preventany axial displacement of the die-holder relative to the rotary holdingarm and to the shaft, the shaft being rotatable for the purpose ofrocking the die-holder into and out of the working position, and beingaxially slidable to enable an extruded product to be severed from anextrusion residue between the die-holder and the bolster, a slide somount-ed on the bolster as to be movable towards and away from theextrusion axis, an abutment on said die holder facing said container,and means on said slide engaging said abutment upon movement of saidslide toward said extrusion axis to prevent movement of said die holderaway from said bolster.

2. An extrusion press as claimed in claim 1, further comprising:two'abutments on the die-holder, on opposite sides of it, a shoulder onthe rotary holding arm adapted to engage one of these abutments, and anabutment on the slide, adapted, in the inwardly displaced position ofthe slide, to engage the other abutment on the die-holder.

3. An extrusion press as claimed in claim 2, the rotary holding armbeing forked to engage the die-holder between its prongs, and the slidecomprising arms adapted, in the inwardly displaced position of theslide, to engage the prongs of the forked holding 'arm.

4. An extrusion press as claimed in claim 1, further comprising lockingmeans to prevent longitudinal displacement of the slidable shaft whenthe die-holderhas approached the bolster, the said locking meansincluding a bearing into and through which one end of the shaft passesas the die-holder approaches the bolster, and a slidable lockingbar'adapted to engage the shaft end after it has passed through thebearing.

References Cited in the file of this patent UNITED STATES PATENTS 819,26-1 Wood May 1, 1906 1,326,138 Putnam Dec. 23, 1919 2,326,606Biggert Aug. 10, 1943 2,633,777 Hoern Apr. 7, 1953 2,896,782 Billen July28, 1959 FOREIGN PATENTS 1,163,770 France Apr. 28, 1958

1. AN EXTRUSION PRESS, COMPRISING: A BOLSTER, A CONTAINER AXIALLYMOVABLE TOWARDS AND AWAY FROM THE BOLSTER, A SHAFT PARALLEL TO THEEXTRUSION AXIS, A ROTARY HOLDING ARM MOUNTED FAST ON THE SAID SHAFT, ADIE-HOLDER CARRIED BY THE ROTARY HOLDING ARM, AND SO HELD AS TO PREVENTANY AXIAL DISPLACEMENT OF THE DIE-HOLDER RELATIVE TO THE ROTARY HOLDINGARM AND TO THE SHAFT, THE SHAFT BEING ROTATABLE FOR THE PURPOSE OFROCKING THE DIE-HOLDER INTO AND OUT OF THE WORKING POSITION, AND BEINGAXIALLY SLIDABLE TO ENABLE AN EXTRUDED PRODUCT TO BE SEVERED FROM ANEXTRUSION RESIDUE BETWEEN THE DIE-HOLDER AND THE BOLSTER, A SLIDE SOMOUNTED ON THE BOLSTER AS TO BE MOVABLE TOWARDS AND AWAY FROM THEEXTRUSION AXIS, AN ABUTMENT ON SAID DIE HOLDER FACING SAID CONTAINER,AND MEANS ON SAID SLIDE ENGAGING SAID ABUTMENT UPON MOVEMENT OF SAIDSLIDE TOWARD SAID EXTRUSION AXIS TO PREVENT MOVEMENT OF SAID DIE HOLDERAWAY FROM SAID BOLSTER.